将 javascript 从后面的代码放在页面上

Put javascript on page from code behind

提问by joncodo

I have some other javascript functions that are being set on the onfocus and onblur events of the textbox that I am using. In these functions it calls a generic javascript function that is not related to any controls. I want to know how to just simply spit this function out to the html of the page from the code behind. Something like this...

我在我使用的文本框的 onfocus 和 onblur 事件上设置了一些其他 javascript 函数。在这些函数中，它调用与任何控件无关的通用 javascript 函数。我想知道如何从后面的代码中简单地将此函数吐出到页面的 html 中。像这样的东西...

Page.ClientScript.RegisterStartupScript(this.GetType(), "?????", getCounter);

EDIT: Here is what I mean

编辑：这就是我的意思

public class MVADTextBox : TextBox
        {
 protected override void OnLoad(EventArgs e)
            {
 var getCounter = "<script language=\"javascript\">" +
                                "function GetCounter(input) {" +
                                    //this function gets the number of special characters taht are in a row.
                                    //it is only the grouping of characters that are right after your current position
                                    "var textbox = document.getElementById(input.id);" +
                                    "var mask = textbox.getAttribute('Mask');" +
                                    "var inputCharacters = textbox.getAttribute('InputCharacters');" +
                                    "var tbid = \"#\" + input.id;" +
                                    "var position = $(tbid).caret().start;" +
                                    "var counter = 0;" +
                                    "for (var i = position; i < mask.length; i++) {" +
                                    "     if (mask[i] != '#') {" +
                                    "        counter++;" +
                                    "        if (mask[i + 1] == '#') {" +
                                    "            break;" +
                                    "        }" +
                                    "    }" +
                                    "}" +
                                    "return counter;" +
                               " }" +
                            "</script>";

                            Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "OnFocus", onFocus);
                            Page.ClientScript.RegisterStartupScript(this.GetType(), "GetCounter(input)", getCounter);



var onBlur = "<script language=\"javascript\"> function PopulateField(input) {if (input.value == \"\") {input.value = input.defaultValue; input.className = 'sampleText'; } } </script>";


  Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "OnFocus", onFocus);

  Page.ClientScript.RegisterClientScriptBlock(this.GetType(), "OnBlur", onBlur);
    }
}

The on blur method is getting sent to the page.

on blur 方法被发送到页面。

回答by James Hill

Answer:

回答：

I believe that Page.ClientScripthas been deprecated. You should be using ClientScriptManager.

我相信这Page.ClientScript已被弃用。你应该使用ClientScriptManager.

Replace your "?????"with the name of the script. Honestly, the name of the script is almostuseless (unless you need to check for its existence later on).

将您"?????"的替换为脚本的名称。老实说，脚本的名称几乎没有用（除非您稍后需要检查它是否存在）。

ClientScriptManager.RegisterStartupScript(this.GetType(), "myCount", getCounter);

Usage Clarification:

用法说明：

//You must surround your code with script tags when not passing the bool param
ClientScriptManager.RegisterStartupScript(this.GetType(),
                   "myCount",
                   "<script>alert('Hey')</script>");

// The last param tells .Net to surround your
// code with script tags (true) or not (false)
ClientScriptManager.RegisterStartupScript(this.GetType(),
                   "myCount",
                   "alert('Hey')", true);

Additional Information:

附加信息：

Signatures from MSDN:

来自 MSDN 的签名：

public void RegisterStartupScript(
    Type type,
    string key,
    string script
)

public void RegisterStartupScript(
    Type type,
    string key,
    string script,
    bool addScriptTags
)

See: http://msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerstartupscript.aspx

请参阅：http: //msdn.microsoft.com/en-us/library/system.web.ui.clientscriptmanager.registerstartupscript.aspx

回答by Hanlet Esca?o

EDITED:

编辑：

 var getCounter = "<script language=\"javascript\">" +
                                        "function GetCounter(input) {" +
            //this function gets the number of special characters taht are in a row.
            //it is only the grouping of characters that are right after your current position
                                            "var textbox = document.getElementById(input.id);" +
                                            "var mask = textbox.getAttribute('Mask');" +
                                            "var inputCharacters = textbox.getAttribute('InputCharacters');" +
                                            "var tbid = \"#\" + input.id;" +
                                            "var position = $(tbid).caret().start;" +
                                            "var counter = 0;" +
                                            "for (var i = position; i < mask.length; i++) {" +
                                            "     if (mask[i] != '#') {" +
                                            "        counter++;" +
                                            "        if (mask[i + 1] == '#') {" +
                                            "            break;" +
                                            "        }" +
                                            "    }" +
                                            "}" +
                                            "return counter;" +
                                       " }" +
                                    "</script>";

        this.TextBox1.Attributes.Add("OnFocus", "GetCounter(this);");
        if (!ClientScript.IsClientScriptBlockRegistered("getCounter")) {
            ClientScript.RegisterClientScriptBlock(this.GetType(), "getCounter", getCounter, false);
        }

回答by Richard Banks

I think you need to use the ClientScriptManager.RegisterClientScriptBlock method

我认为您需要使用 ClientScriptManager.RegisterClientScriptBlock 方法

Try this

试试这个

回答by Adam Rackis

You would put the actual function definition, which you already have in getCounter. Note that the second parameter which you currently have as "????", as James pointed out, is for the script's key, which must be unique from all other scripts registered for this type. The third parameter is the script itself, and the fourth determines whether script tags are to be added, which needs to be false, since you already added them.

您可以将实际的函数定义放在 getCounter 中。请注意"????"，正如 James 指出的，您当前拥有的第二个参数 as用于脚本的key，它必须与为此类型注册的所有其他脚本不同。第三个参数是脚本本身，第四个决定是否要添加脚本标签，需要为false，因为你已经添加了它们。

Page.ClientScript.RegisterStartupScript(this.GetType(), 
      "someKeyForThisType", getCounter, false);